10-13-2004 06:50 PM - edited 03-02-2019 07:14 PM
If GLBP tracks an interface, and the priority changes because an interface goes down, the secondary router takes over as AVF, but it doesn't take over the active state of all the MAC addresses unless the other router goes away. This means that one router must rcv half of the traffic, but sends it out the same port so it can go out the other router.
I've done some testing by manually setting the priorities, these are the results -
Router1#sh run int fast 0/0
interface FastEthernet0/0
ip address 10.158.56.3 255.255.255.128
glbp 1 ip 10.158.56.1
glbp 1 preempt
Router1#sh glbp b
Interface Grp Fwd Pri State Address Active router Standby router
Fa0/0 1 - 100 Active 10.158.56.1 local 10.158.56.2
Fa0/0 1 1 7 Listen 0007.b400.0101 10.158.56.2 -
Fa0/0 1 2 7 Active 0007.b400.0102 local -
Router2#sh run int fast 0/0
interface FastEthernet0/0
ip address 10.158.56.2 255.255.255.128
glbp 1 ip 10.158.56.1
glbp 1 priority 50
Router2#sh glbp b
Interface Grp Fwd Pri State Address Active router Standby route
Fa0/0 1 - 50 Standby 10.158.56.1 10.158.56.3 local
Fa0/0 1 1 7 Active 0007.b400.0101 local -
Fa0/0 1 2 7 Listen 0007.b400.0102 10.158.56.3 -
By my interpretation, the router with the 100 priority should be the Active router for all MACs.
Any help on this would be appreciated.
10-14-2004 05:54 AM
Use weighting to control the AVF
interface Vlan4
ip address 10.1.4.2 255.255.252.0
ip helper-address 151.102.96.100
glbp 4 ip 10.1.4.1
glbp 4 timers 1 3
glbp 4 weighting 115 lower 100 upper 104
glbp 4 weighting track 11
glbp 4 weighting track 21
glbp 4 forwarder preempt delay minimum 90
I have found you can clear the ARP cache on the PC and see which AVF you pick up.
10-14-2004 10:07 AM
Thanks! I got it now....
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide